diff --git a/slides/cours_11.md b/slides/cours_11.md
index 6f3c87563b41fd858222d1329955979ffd058428..4a68ab3c4428c4dced1d6f1ebfe9f1b8c7942841 100644
--- a/slides/cours_11.md
+++ b/slides/cours_11.md
@@ -313,8 +313,8 @@ typedef struct _queue {    // File d'attente:
 ```C
 void queue_init(queue *fa); // head = tail = NULL
 bool queue_is_empty(queue fa); // fa.head == fa.tail == NULL
-int queue_tail(queue fa); // return fa.head->data
-int queue_head(queue fa); // return fa.tail->data
+int queue_tail(queue fa); // return fa.tail->data
+int queue_head(queue fa); // return fa.head->data
 ```
 
 ## Manipulations et destruction